154 A MONOGRAPH OF THE AUSTRALIAN SPONGES. 



This brief historic introduction has — as far as the older works 

 are concerned — been compiled from Pagenstecher's (175) Historic 

 review, Johnston's (176) introduction to the British Sponges, and 

 particularly from "Vosmaer's (177) excellent review of which 

 unfortunately only the first part has at present appeared (178). 



Far from being complete, this historic introduction can only 

 serve to enable the student to find the most important works on 

 our subject. 



It may, however, be of service also as illustrating the history 

 of science, and indicating the enormous advances made during late 

 years in Zoological discovery. 



(175). Pagenstecher. Zur Kenntniss Der Schwcimme. I. Geschichtliche 

 Einleitung. Verhandlungen. Verein. Heidelberg. Vol. VI. (1872), p. 1. 



(176). G. Johnston. History of British Sponges and Lithphytes. Edinburgh, 

 1842. 



(177). G. Vosmaer. Porifera. Bronn's Klassen und Ordnungen des 

 Thierreiches. Band II., Heft 1, 2. 



(178) The whole of that review has appeared whilst this essay was in 

 print, and I refer the reader who wishes to go more into detail, to that 

 publication. (I.e., Heft 3.) 



